Resolve "Create dummy trajectory spoofer"

Description

It generates dummy trajectories, that can be used for testing of the controller. Can be launched by the command ros2 launch trajectory_spoofer trajectory_spoofer.launch.py

• For more details, see the issue #233 (closed).

Notes for Reviewer

• Can generate only 2 types of trajectories, straight and circle as shown in #233 (closed)
• Does not implement ramp-up to target velocity and directly applies target velocity
• can launch with controller but does not work properly ros2 launch autoware_auto_avp_demo integration_trajectory_spoof_mpc_control_lgsvl.launch.py
• left/right variation of circle not implemented
• Many other standard testing trajectories like curvature, figure of eight, sine wave can be added later but not implement here.

Checklist

• Documentation was updated